| Value | Category | Cases | |
|---|---|---|---|
| -1 | Missing | 0 |
0%
|
| 0 | Never | 430 |
35.8%
|
| 1 | Once or twice | 84 |
7%
|
| 2 | Several times | 38 |
3.2%
|
| 3 | Many times | 8 |
0.7%
|
| 7 | Not applicable/Saw no problems | 638 |
53.2%
|
| 9 | Don't know | 2 |
0.2%
|
| 998 | Refused | 0 |
0%
|